content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import java.util.Objects;
  
  import org.reactivestreams.Subscriber;
  
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.Function;
  import io.reactivex.rxjava3.operators.QueueSubscription;
  import io.reactivex.rxjava3.internal.subscribers.BasicFuseableSubscriber;
  
  /**
   * Maps the error from upstream into another Throwable.
   *
   * @param <T> the value type
   */
  final class SoloMapError<T> extends Solo<T> {
  
      final Solo<T> source;
  
      final Function<? super Throwable, ? extends Throwable> errorMapper;
  
      SoloMapError(Solo<T> source, Function<? super Throwable, ? extends Throwable> errorMapper) {
          this.source = source;
          this.errorMapper = errorMapper;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          source.subscribe(new MapErrorSubscriber<T>(s, errorMapper));
      }
  
      static final class MapErrorSubscriber<T> extends BasicFuseableSubscriber<T, T> {
  
          final Function<? super Throwable, ? extends Throwable> errorMapper;
  
          MapErrorSubscriber(Subscriber<? super T> downstream,
                  Function<? super Throwable, ? extends Throwable> errorMapper) {
              super(downstream);
              this.errorMapper = errorMapper;
          }
  
          @Override
          public void onNext(T t) {
              downstream.onNext(t);
          }
  
          @Override
          public void onError(Throwable t) {
              Throwable ex;
  
              try {
                  ex = Objects.requireNonNull(errorMapper.apply(t), "The errorMapper returned a null Throwable");
              } catch (Throwable exc) {
                  Exceptions.throwIfFatal(exc);
                  ex = new CompositeException(t, exc);
              }
  
              super.onError(ex);
          }
  
          @Override
          public int requestFusion(int mode) {
              QueueSubscription<T> qs = this.qs;
              return qs != null ? qs.requestFusion(mode) : NONE;
          }
  
          @Override
          public T poll() throws Throwable {
              return qs.poll();
          }
      }
  }
  